Dr. Terry Harville of Arkansas Children’s Hospital and the University of Arkansas for Medical Sciences Medical School, left, and mountain-dulcimer player and teacher Linda Brockinton play during a lecture and performance on music therapy and healing for an audience of around 30 people at the Mabel Boswell Memorial Library in Bryant on Friday. During the presentation, Brockinton played music, then slowed its tempo. Afterward, several members of the audience said the slower music lowered their heart rates.